<!--这是全国城市列表页-->
<!--需求：根据后台数据显示城市列表，能够动态滚动，自动根据内容排版，有按照拼音分组输出-->
<!--难点：数据动态获取，从父组件获取，列表动态分组渲染-->

<template>
	<div class="list" ref="wrapper">
		<div>
			<div class="area">
				<div class="title border-topbottom" @click="aaa()">当前城市</div>
				<div class="button-list">
					<div class="button-wrapper">
						<div class="button">{{this.currentCity}}</div>
					</div>
				</div>
			</div>
			<div class="area">
				<div class="title border-topbottom">热门城市</div>
				<div class="button-list">
					<div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
						<div class="button">{{item.name}}</div>
					</div>					
				</div>
			</div>
			<div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
				<div class="title border-topbottom">{{key}}</div>
				<ul class="item-list">
					<li class="item border-bottom" v-for="innerItem of item" :key="innerItem.id" @click="handleCityClick(innerItem.name)">
						{{innerItem.name}}
					</li>
				</ul>
			</div>
		
		</div>
	</div>
</template>

<script>
	import Bscroll from 'better-scroll'
//	利用vuex实现子组件之间的数据通讯
	import { mapState, mapMutations } from 'vuex'

	export default{
		name:'CityList',
		props:{
			hot:Array,
			cities:Object,
			letter:String
		},
		computed:{
			...mapState({
				currentCity:'city'
			})
		},
		methods: {
			handleCityClick (city) {
				this.$store.commit('changeCity',city)
				this.changeCity(city)
				this.$router.push('/')
			},
			...mapMutations(['changeCity'])
		},
		watch:{
			letter () {
				if(this.letter){
					const element = this.$refs[this.letter][0]
					this.scroll.scrollToElement(element)
				}
			}
		},
		mounted () {
			this.scroll = new Bscroll(this.$refs.wrapper);
		}
	}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
	.border-topbottom
		&:before
			border-color:#ccc
		&:after
			border-color:#ccc
	.border-bottom
		&:before
			border-color:#ccc
	.list
		position:absolute
		overflow:hidden
		top:1.58rem
		left:0
		right:0
		bottom:0
		.title
			line-height:.54rem
			background-color:#eee
			padding-left:.2rem
			color:#666
			font-size:.26rem
		.button-list
			padding:.1rem .6rem .1rem .1rem
			overflow:hidden
			.button-wrapper
				float:left
				width:33.33%
				.button
					margin:.1rem
					padding:.1rem 0
					border-radius:.06rem
					text-align:center
					border:.02rem solid #ccc
		.item-list
			.item
				line-height:.76rem
				padding-left:.2rem
</style>